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Thread: Lowering pH

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    tcat's Avatar
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    Lowering pH

    Pool calculator keeps telling me to add 9 oz of MA to get my pH from 7.8 to 7.5... I "think" my pH is 7.7-7.8, but I've added at least 24 oz of MA (8 oz at a time) and color doesn't seem to change. All my other numbers are on target and pool is very clear. 31% Home Depot MA.
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    linen's Avatar
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    Re: Lowering pH

    What is your TA and Borate level (if you have added borates)?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    topher's Avatar
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    Re: Lowering pH

    you introducing acid slowly? MA is heavier than water and doesn't mix that easy if not being stirred around. I pour mine VERY slowly in front of the return jet. and then usually brush some walls after wards. also how long are you waiting after before you check?
    13500 gallon AG, build late 90's, Hayward S220T sand filter,1Hp aqua coastal
    Gasser BBQ broilmate 155154 LP, Smoker CGK (akorn)

    ,

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    Re: Lowering pH

    Is it possible you are over 8?
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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    tcat's Avatar
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    Re: Lowering pH

    I could be over 8... I add slowly, try to make it a minute for 8 ounces (although that can be difficult). I don't add Borate and not tested for it. TA = 110
    Still appears to be 7.8 with Taylor kit and with a test strip. Testing at least 12 hrs after.
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    linen's Avatar
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    Re: Lowering pH

    What is your FC level now?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    tcat's Avatar
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    Re: Lowering pH

    5.0-5.5
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    duraleigh's Avatar
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    Re: Lowering pH

    pH changes, by their nature, are not always 100% predictable but if you add enough acid, it WILL go down....that's guaranteed.

    7.8 is certainly in an acceptable range already but it sounds like yours may have been a little higher so good you are lowering it.

    9 oz poured in front of a return could be put in quite a bit quicker....15 seconds is fine to let it dilute and disperse. the change should take affect within 30-60 min.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Lowering pH

    It will be safe to check 1/2 hour after adding the acid and you can keep adjusting every 1/2 hour if you want to.

    If you are actually not reading your pH high enough then the color change might not be noticable until until the pH drops below 7.6ish. When you get to the low 7's then you will see the yellowish color and it is a lot easier to read. It's the darker shades that take some time getting used to.
    16k gal plaster with raised spa, Jandy DEV60 filter, 2 HP 2-speed SHPF Jandy Stealth pump
    Hayward Aqua Rite T-15 SWCG, Jandy LXi 400k BTU NG heater, 350 sq.ft. of Sun Star solar panels, TF-100 Test Kit, Dolphin s300i Cleaner
    Test Kits . Pool Math . Chlorine/CYA Chart . The SLAM Process

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    tcat's Avatar
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    Re: Lowering pH

    Happy to say it appears to be 7.5-7.6 after adding 12 more oz. Wish there was a "drop by drop" method for testing pH like the FC method.

    Got to say thanks to everyone here. Been doing BBB (more like BA) for the past 4 weeks (since I dropped my $110 service), and have spent at most $12 in 4 weeks! (other than the water to get my CYA down to 50). Almost used one bottle of MA, and one 182 oz bottle of Clorox, that's it! I do run tabs for 1 in 4 weeks just to get rid of them, since it rained a lot and CYA got down to 35. Clear 84 degree water for the entire period (amazing what shade does for the Texas heat).
    IG pebble, 15,000 gallon
    48 PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    Re: Lowering pH

    Congrats! You confirmed my suspicion, you were over 8 and it took more MA to lower your pH than you estimated.

    Also, congrats for firing your pool service!
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
    If TFP has helped you, please click to SUPPORT TFP!

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